From e3140d6e547b89e0abbe3cf7f6fe68acf4aa18ed Mon Sep 17 00:00:00 2001
From: Sandro Ronco <sandro.ronco@gmx.com>
Date: Wed, 30 Nov 2016 19:52:27 +0100
Subject: [PATCH] microtouch: added output status command and fixed data
 transmission at 2400 baud.

---
 src/devices/machine/microtch.cpp | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/devices/machine/microtch.cpp b/src/devices/machine/microtch.cpp
index b8a810bcbda..4f6d10c3cea 100644
--- a/src/devices/machine/microtch.cpp
+++ b/src/devices/machine/microtch.cpp
@@ -120,10 +120,12 @@ void microtouch_device::device_timer(emu_timer &timer, device_timer_id id, int p
 
 	if ( m_tx_buffer_ptr < m_tx_buffer_num )
 	{
-		m_output = m_tx_buffer[m_tx_buffer_ptr++];
-		m_output_valid = true;
 		if(is_transmit_register_empty())
+		{
+			m_output = m_tx_buffer[m_tx_buffer_ptr++];
+			m_output_valid = true;
 			tra_complete();
+		}
 
 		if ( m_tx_buffer_ptr == m_tx_buffer_num )
 		{
@@ -263,6 +265,32 @@ void microtouch_device::rcv_complete()
 			m_rx_buffer_ptr = 0;
 			return;
 		}
+		else if ( check_command("OS", m_rx_buffer_ptr, m_rx_buffer ) )
+		{
+			// output status
+			m_tx_buffer[m_tx_buffer_num++] = 0x01;
+
+			// ---- ---x    RAM error
+			// ---- --x-    ROM error
+			// ---- -x--    Analog-to-digital error
+			// ---- x---    NOVRAM error
+			// ---x ----    ASIC error
+			// --x- ----    Power on flag
+			// -x-- ----    Always 1
+			// x--- ----    Always 0
+			m_tx_buffer[m_tx_buffer_num++] = 0x40;
+
+			// ---- ---x    Cable NOVRAM error
+			// ---- --x-    Hard NOVRAM error
+			// ---x xx--    Reserved
+			// --x- ----    Software reset flag
+			// -x-- ----    Always 1
+			// x--- ----    Always 0
+			m_tx_buffer[m_tx_buffer_num++] = 0x40 | (m_reset_done << 5);
+			m_tx_buffer[m_tx_buffer_num++] = 0x0d;
+			m_rx_buffer_ptr = 0;
+			return;
+		}
 		// send response
 		m_tx_buffer[m_tx_buffer_num++] = 0x01;
 		m_tx_buffer[m_tx_buffer_num++] = 0x30;